|Mesoscale Discussion 826|
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Mesoscale Discussion 0826
NWS Storm Prediction Center Norman OK
0926 AM CDT Wed May 24 2017
Areas affected...extreme southern GA into northern FL
Concerning...Tornado Watch 261...
Valid 241426Z - 241600Z
The severe weather threat for Tornado Watch 261 continues.
SUMMARY...Strong, locally damaging winds and tornadoes will be
possible into the afternoon hours across far southern GA into
DISCUSSION...The tornado threat will continue across WW 261.
Regional 88-D VAD wind profiles continue to indicate favorable shear
environment for low-level rotation with effective SRH values near
200 m2/s2. Most recently, a cell over Putnam and St. Johns counties
in northeast FL has shown strong rotation at times. A larger mass of
thunderstorms further west moving into far southern GA and onshore
the northwestern FL coast may pose more of a damaging wind threat
given messier convective mode. Regardless, environmental parameters
will remain favorable for strong winds and tornadoes into the
afternoon hours. A southward extension of the watch into central FL
may be needed in the short term as storms approach the western FL
coast near the watch expiration time of 19z. However, a new watch
may be needed this afternoon across parts of central FL.
Across the eastern FL Peninsula, a low-end threat will continue for
a few more hours as the surface cold front remains to the west of
the area. Cells moving into this area have shown some signs of
intensifying over the last 30 minutes, so have no suggested
clearance of counties across this area just yet. A very moist
boundary layer remains in place despite earlier convection and a
short-term severe threat will persist across this area.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 31138542 30298082 28368070 28068380 28868592 29648645
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